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Finding the Fourth Proportional to 936.20, 1,400.70 and 612.20

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Solution

The fourth proportional to 936.20, 1,400.70 and 612.20 is: 915.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.20 : 1,400.70 = 612.20 : x
  2. Step 2: Convert to fraction form
    936.20/1,400.70 = 612.20/x
  3. Step 3: Cross multiply
    936.20x = 1,400.70 × 612.20
  4. Step 4: Simplify right side
    936.20x = 857,508.54
  5. Step 5: Solve for x
    x = 857,508.54/936.20
  6. Step 6: Final answer
    x = 915.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.